Separation of powers is the idea that power in a government should be broken up or divided. This is shown in the US government with the 3 branches of government. The Legislative, Executive, and Judicial branches work together yet separately to run the government. This makes sure that no one person or group can control the government, and all branches have to agree. This ties into checks and balances, where each government branch makes sure the others are doing their job and being responsible.
A because Japanese were the ones attacking, sympathy for the americans who were killed and injured
If the machine or person cannot do the job then they are replaced.